Faster CI pipeline

This pipeline is faster by:

• test only on branches other than master
• build the package on merge request (or branch with associated merge request) but do not archive the resulting eclipse package
• build all then deploy the eclipse package and update site on the atsyra2.irisa.fr (nightly) for master branch

it uses cache/untracked:true to save build time between phases for build package and deploy (content is too large to be sent via artifact )